C++ call wrapper (hook)

void wrapper(SomeClass const *_this, int param)
{
    // Get some stuff done before
    std::cout << "Pre call to SomeClass::mem_fn()" << std::endl
                        << "  this = " << _this << std::endl
                        << "  param = " << param << std::endl;

    // Get and call orig
    Hook<SomeClass>::call_once<2>(_this, param);

    // Get some stuff done after
    std::cout << "Post call to SomeClass::mem_fn()" << std::endl;
}

// This example will print:
//
// $ ./class-test
// Pre call to SomeClass::mem_fn()
//   this = 0x1d8ec20
//   param = 42
// Original SomeClass::mem_fn()
//   this = 0x1d8ec20
//   param = 42
// Post call to SomeClass::mem_fn()

int main()
{
    // Create object instance
    SomeClass *some_object = new SomeClass;

    // Hook
    Hook<SomeClass>::install<2>(some_object, wrapper);

    // Wrapped call
    some_object->mem_fn(42);

    // Delete object instance
    delete some_object;

    return 0;
}